In an article on „The Generation of Rhythm-Related Reward and Emotion (RRRE) System“, Tianyan WANG of the Shenzhen Institutes of Advanced Science suggests that every pitch interval between neighboring notes in music represents corresponding movement pattern through interpreting the Doppler effect of sound, which integrates music and dance into a common form—rhythmic movements. Animals have a rhythm-related reward and emotion (RRRE) system, which is further developed in humans into society-related rewards and emotions (SRREs). Both are evoked by music and dance, and have biological and social functions, which in turn, promote the evolution of music, dance and speech. About 20 years ago, an 8000 year old flute was unearthed in Henan Province.
Tianyan WANG, http://journal.frontiersin.org/article/10.3389/fnins.2015.00030/full